Home / 20,820.92-28,729.60-11,868.80

Finding the Fourth Proportional to 20,820.92, 28,729.60 and 11,868.80

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Solution

The fourth proportional to 20,820.92, 28,729.60 and 11,868.80 is: 16,377.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.92 : 28,729.60 = 11,868.80 : x
  2. Step 2: Convert to fraction form
    20,820.92/28,729.60 = 11,868.80/x
  3. Step 3: Cross multiply
    20,820.92x = 28,729.60 × 11,868.80
  4. Step 4: Simplify right side
    20,820.92x = 340,985,876.48
  5. Step 5: Solve for x
    x = 340,985,876.48/20,820.92
  6. Step 6: Final answer
    x = 16,377.08

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.